Solve the following Systems of Equations by Substitution or Elimination
y = -2x
7x - 8y = -23
A (-1,2)
B (-3,5)
C(4,-7)
D(4,1)
E No Solution
F Infinite Solutions
Answers
using substitution:
substitute-2x for y in the second function
7x - 8(-2x) = -23
solve for x
7x + 16x = -23
23x = -23
x = -1
plug x = -1 into a function to find y, in this case ill plug it into the first
y = -2(-1)
y = 2
since x = -1 and y = 2
the answer is A (-1,2)
Work shown in pic below
I used substitution method.
Related Questions
Jessie traveled 60 miles in 1 hour. At the same rate, how far would she travel in 10 hours?
Answers
Answer:
600 mph
Step-by-step explanation:
60 x 10 = 600
Answer:
600
Step-by-step explanation:
if she travled 60 in 1 hour you multiply that by 10 so it woupd be 600 in 10 hours
Solve:
5(n — 3) = 30
Answers
Answer:
n = 9
Step-by-step explanation:
5(n-3) = 30
Expand the brackets. (Multiply n by 5 then multiply -3 by 5.)
5n-15 = 30
Isolate 5n.
5n = 30+15
Evaluate.
5n = 45
Find n.
n = 45 ÷ 5
n = 9
Answer:
n = 9
Step-by-step explanation:
1) divide both sides by 5 to cancel it out
(n-3=6)
2) add 3 to each side to cancel out the -3
(n=9)
You could factor the 5 to get 5n-15=30 but dividing by 5 just makes the number easier
The middleweight division in wrestling is centered at 140 pounds. Deviation from that must be less than 15 pounds either way. Write and solve the Absolute value inequality. What is the range of the possible weights for the lightweight division?
Answers
Answer: 125lb < M < 155 lb
Step-by-step explanation:
The mean mass is 140 lb, and the deviation must be less than 15 pounds (exactly 15 is not accepted).
Then (140lb + 15lb) is not alowed, and (140lb - 15lb) is not alowed.
Then we can define M = mass.
We have the two equations:
M < 140lb + 15lb
M < 155lb
And
M > (140lb - 15lb)
M > 125lb
If we write these two relations togheter, we get:
125lb < M < 155 lb
will give brainlist whoever asks correctly
Answers
Answer:
The answer is B.-3/2
Please correct me If I am wrong
Step-by-step explanation:
I use [tex]\frac{rise}{run}[/tex]
Also, you automatically know that the line is decreasing
Find the area of the shape below.
Answers
Answer:
235
Step-by-step explanation:
11x14=154
20-11=9
9x9=81
81+154=235
Express: 50 minutes 18 seconds as percent of 2 hours.
Answers
Answer:
For me
Step-by-step explanation:
50 minutes to seconds=50×60=3000
18 minutes remains the same
3000+18=3018
3018/7200×100
301800/7200
41.917
(2x+y=0
{
-x + 3y = -14
Answers
Answer:
x=2 y=-4
Step-by-step explanation:
-2x=y
-x-6x=-14
-7x=-14
x=2
What best describes the end behavior of the graph of f(x)=-x^4+5x-5
Answers
Answer:
It describes multiplication
Step-by-step explanation:
As you can see its 5x-5 (the x is say "by" or "of), So when you look at it you can clearly see it's multiplication.
What are the steps you should follow to solve this equation. I don't need the solution, just the steps. 4x + 3 - 2x = 5x - 2 - x
Answers
Answer:
x = 5/2
Step-by-step explanation:
4x + 3 - 2x = 5x - 2- x
Re-writing the eqn, we get,
4x - 2x + 3 = 5x - x - 2
2x + 3 = 4x - 2
3 + 2 = 4x - 2x
5 = 2x
∴ x = 5/2
The ordered pair (-4,7) is found in which quadrant?
A. 1
B. 2
C. 3
D. 4
Answers
Answer:
first quadrant
Step-by-step explanation:
What is the y-intercept of this graph
Answers
Write the sentence as an equation.
367 is 2 divided by a
Answers
Answer:
Step-by-step explanation:
183.5
Answer:
the answer is 183.5
Step-by-step explanation:
What is the approximate force of kinetic friction on a 50kg object sliding horizontally with a coefficient
of = 0.5
2. 5ON
b. 5OON
c. 25N
d. 250N
Answers
Answer:
F = 250 N
Step-by-step explanation:
Given that,
Mass of an object, m = 50 kg
The coefficient of kinetic friction = 0.5'
We need to find the force of kinetic friction. The kinetic friction is given by the formula as follows :
[tex]F=\mu N[/tex]
N is normal force, N = mg
[tex]F=0.5\times 50\times 10\\\\F=250\ N[/tex]
Hence, the force of kinetic friction is 250 N. Hence, the correct option is (d).
multiple. 7i (4-2i)
Answers
Answer:
14+28i
Step-by-step explanation:
Find the value of c that completes the square. m2 - 26m + c
Answers
Answer:
c = 169
Step-by-step explanation:
Given
m² - 26m
To complete the square
add ( half the coefficient of the m- term)² to m² - 26m
m² + 2(- 13)m + (- 13)²
= m² - 26m + 169 ( with c = 169 )
= (m - 13)² ← perfect square
Please help me I’ll give brainliest ❤️
Answers
On the last day of the schoolbook fair, all pencils were one set price and all books were a different set price. Sammy
bought 2 pencils and 6 books for $14. Belle bought 4 pencils and 1 book for $8. What was the set price for a pencil?
What was the set price for a book?
Answers
Answer: wee wee woo woo peep pop doo doo
Step-by-step explanation:You have to be a cool kid to know answer
Answer: Ax+By=c
2x+6y=14
4x+1y=8
x=1.54
y=1.82
Step-by-step explanation:
Consider the function f(x) = 3x - 2 and the function g(x) , which is represented by the table below.
Answers
Answer:
Its is A,C,D,
Step-by-step explanation:
Find the vertex angle of an isosceles
triangle if the measure of one base angle is
36º.
Answers
36x2=72
180-72=108
hope this helps! :)
Find x. Pls helppppppp
Answers
Step-by-step explanation:
Angles DEC and DFC are both 90°, therefore DC is the diameter of the circle.
That makes angle DBC = 90° as well, so x = 90.
Which equation has an infinite number of solutions?
A) -7+2x=8
B) -7+2x=7+2x
C) -7+2x=2-9+2x
D) -7+2x=x
Answers
what is 3⁴ x 3-⁵ x 3-² = ⅓ ⁿ
Answers
The Answer:
= Your mom
Answer:
n = 4
Step-by-step explanation:
Add the powers of 3
4 -5 -3 = - 4
Now these make just 1 power that you have to deal with.
3^-4
and that equates to 1/3 ^ n = 3^ -n
So what is the answer?
3^-4 = 3^-n
Since the bases are the same, the powers can be equated.
- 4 = - n
divide by - 1 to get 4 = n
Put each equation in standard form and state the values of a, b and c.
Answers
1) a = 2, b= 3, c=2,
2) x^2 -2x-4 (a = 1, b=-2, c =-4)
3) x^2+x+3 (a,b = 1, c = 3)
4) 7x^2+8x-4 (a=7, b=8, c=-4)
Please help asap! One question!! Please I’m desperate!
Answers
Answer:
A
Step-by-step explanation:
Answer:
A, B, C
Step-by-step explanation:
Use a^2 + b^2 = c^2 in each case.
A.
3^2 + (sqrt(27))^2 = 6^2
9 + 27 = 36
36 = 36
A. does form a right triangle.
B.
8^2 + 15^2 = 17^2
64 + 225 = 289
289 = 289
B. does form a right triangle.
C.
5^2 + 5^2 = (sqrt(50))^2
25 + 25 = 50
50 = 50
C. does form a right triangle.
Please help?
Simplify: (4a−2b)(a+b) 4a2−8ab−2b2 4a2−6ab−2b2 4a2+2ab−2b2 4a2−2ab−2b2
Answers
Answer:
Step-by-step explanation:
4a^2 + 4ab - 2ab - 2b^2
4a^2 + 2ab - 2b^2
find the ratio of 3:2 9:x
Answers
Answer:
9:6
Step-by-step explanation:
You can find x by setting the ratios equal to each other.
[tex]\frac{3}{2} = \frac{9}{x}[/tex]
Now you just need to solve for x.
[tex]\frac{3}{2} = \frac{9}{x} \\\frac{3}{2}x = 9\\x = 6[/tex]
The ratio is 9:6.
Answer:
9/6
Step-by-step explanation:
there ya go.
They took this question down dont know why but can you guys help me having a lil bit trouble 1+1=? :))
Answers
Answer:
The answer is 2
Step-by-step explanation:ckhg
1 added by 1 = 2. hk,khgkhdgkgdlkg
Thanks for the free points! :D
What does the word ratio mean in your own words HELP ASAP plz!!gghjblpjjgffffcvc
Answers
For #7-8, is the relation a function?
7) (4,2), (1,2), (0,1), (-2,2), (3,3)
8) (6,5), (4,3), (6,4), (5, 8)
Answers
Answer:
7) yes its a function
8) no its not a function
Step-by-step explanation:
Hope this helps :)
Which of the following lines is not parallel to the graph of y=3x +9?
Answers
Answer:
C
Step-by-step explanation:
not parallel mean that not equal slope
so it will be C
hope this helps
Answer:
C.
Step-by-step explanation:
When written in y=mx+b form, C is y=1/3x+10/3.
Parallel lines have the same slope
